Ok, lets update this a bit. I had a really good time there with my gf.
Really good track for general admission, you can see well from so many parts off the track. Only minus here is the lack of screens so it is hard to follow action on other areas of track.
I visited the chicane, the few next corners and finally the race from the small hill above the finish straight (do not really recommend, bit too much people I think)
So, the few minus areas. Like mentioned above lack of screens and/or even loudspeakers. Food, not really good and the prices are really bad for those options. And lastly the transportation. And well connecting to that, queing to head outside from the track, police lost completely control and people acted like aholes and LOTS of pushing and shoving. Even children and women took hit in that, unacceptable.
I really can not recommend the fanbus from Budapest. Just sooooo much people and one bus every 30 mins. Take the train to Kerepes or the next stop. From there it is way less people to the fan bus or if you want it is about 2 km easy walk to the track.
The additional approximately 1€ fare is well worth it.
Also wow, when did the f1 merchandise get so expensive? No wonder there was still some Caterham stuff for sale when the price for t-shirt is 35€ in "clearance"...
All in all really nice experience, might head out there again some day (if so, I will get a grand stand ticket just for the reserved spot on sunday)
Big thanks to Augurk for all the tips. Will update this later with some pictures.